Thornton, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Thornton, a community in San Joaquin County, California.
Today
97°F
Sunny
Sunny, with a high near 97. West wind 6 to 13 mph, with gusts as high as 20 mph.
7-day forecast for Thornton
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 97°F | Sunny | 6 to 13 mph W | 0% |
| Tonight | 59°F | Clear | 6 to 13 mph WSW | 0% |
| Wednesday | 96°F | Sunny | 7 to 12 mph WSW | 0% |
| Wednesday Night | 59°F | Clear | 6 to 12 mph W | 0% |
| Thursday | 97°F | Sunny | 6 to 13 mph W | 0% |
| Thursday Night | 59°F | Clear | 6 to 13 mph W | 0% |
| Friday | 99°F | Sunny | 6 to 12 mph W | 0% |
| Friday Night | 62°F | Clear | 6 to 12 mph WSW | 0% |
| Saturday | 100°F | Sunny | 6 to 12 mph W | 0% |
| Saturday Night | 63°F | Clear | 5 to 12 mph WSW | 0% |
| Sunday | 97°F | Sunny | 5 to 12 mph W | 0% |
| Sunday Night | 60°F | Mostly Clear | 5 to 12 mph WSW | 0% |
| Monday | 91°F | Sunny | 6 to 13 mph W | 0% |
| Monday Night | 57°F | Mostly Clear | 5 to 13 mph WSW | 0% |
Forecast source: National Weather Service (api.weather.gov) for Thornton (38.230, -121.426). Updated through the day.
Growing snapshot for Thornton
Last spring frost
Feb 9
First fall frost
Dec 5
Growing season
301 days
Hardiness zone
9b
More local growing data for Thornton: nearby ZIP 95242 weather · frost dates · planting calendar · California frost dates
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Climate data from the nearest NOAA station, Lodi, Ca (5.7 mi from Thornton). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.